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I ran a separate wire from the negative buss on the firewall to the negative screw on the tach. Worked like a charm.

I got it figured out. I grounded the tach case and it worked as designed. So I learned something today. Thanks for everybody’s help.

OK I will be back at the shop later and will try it. Thanks for your help. Stay tuned.....

Yes I spun it in both directions and also swapped the leads to the sender. Needle still dead. Do you think the tach case should be grounded also?

It's been over two years since I purchased the brand new Tach and am just now getting around to installing it. Before I go to the effort to design and build a custom gauge panel for the tach, I wanted to test it with the sending unit to make sure everything worked. Well, I connected 24v and...

Yes that is exactly what I am looking for. Thanks for posting.

Thanks. Would you happen to know a source for the tach?

Yes the 0 to 3500 buss bar type is what I am interested in. I saw one on Ebay recently but it had a translucent housing so light could enter the sides. Since my application will not have that type of lighting, I was curious to know if the earlier HMMWVs used a tach with a bulb socket. Thanks.

I’m in the process of installing a new 6.5 engine in my M1028 CUCV truck, mated to a rebuilt 700R4 transmission. Because the 700R4 will not require vacuum to operate, I have installed a HMMWV oil pump drive in place of the vacuum pump on the rear of the engine valley. Because the oil pump drive...